I recently purchased a 1996 Camaro Z28 with the LT1 engine.  According
to the Hanes manual, the car should take 5 quarts of 5w-30 oil,
however, after fully draining the system and changing the oil filter,
the car only took 4 quarts.  Any idea why this is?

When I bought the car, the oil level was about an inch over the
dipsticks acceptable oil level line indicating that the previous owner
had overfilled the system by about a quart.  This contributed to alot
of oil being thrown into the throttle body through the PCV valve and
breather hoses. My guess is that he thought the car should take the
recommended 5 quarts.

The car was level when I changed the oil and was completely drained
before I put the new oil in.  Any idea why this might be?  Has anyone
else had this problem?

Thanks for the help folks.

-Nathaniel